Mine sits on a concrete pad under a RV Port. I have 3 outlets on a storage building beside it, 50A, 30A, and regular 20A outlets. I also have a faucet there. We use it as a guest/grandkids house. The fridge is never turned off and always stocked with drinks. The grandkids love it. It also serves as a man cave.
I currently don't have a sewer hookup but the macerator idea has me thinking about getting one. Gray water can run on the ground. It's the black I worry about. That would convert it to full service.
On the concrete vs gravel vs whatever. Anything would probably be fine for storage but it sure is nice to get on my creeper and scoot under the rv to check out the bottom side every so often. One advantage of the newer rv's that they are high up to match the new trucks.
